2-34.17 Clauses and Provisions When determining indirect cost rates, use the following: Clause 2-30: Allowable Cost and Payment. Whenever cost or pricing data may be required in negotiating a contract or the subsequent modification of a contract, the contract must include the following: Clause 5-1: Price Reduction for Defective Cost or Pricing Data. Clause 5-2: Subcontractor Cost or Pricing Data. When cost or pricing data submitted is required to be certified, the contract must include the following: Clause 5-4, Certification of Cost or Pricing Data.